package cn.com.ahao.gateway.interceptor;

import cn.com.ahao.gateway.context.GatewayContext;
import cn.com.ahao.gateway.context.GatewayContextHolder;
import cn.com.ahao.gateway.util.TraceIdUtil;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.slf4j.MDC;
import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.handler.HandlerInterceptorAdapter;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class TraceInfoInterceptor extends HandlerInterceptorAdapter {

    private Logger logger = LoggerFactory.getLogger(this.getClass());

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        logger.info("====== TraceInfoFilter start ======");
        String traceId = TraceIdUtil.shortUUID();
        // 1.将traceId放到上下文中，后续传递给微服务
        GatewayContext context = GatewayContextHolder.getContext();
        context.setTraceId(traceId);
        GatewayContextHolder.setContext(context);
        // 2.将traceId设置到slf4j中，日志打印模板配置打印traceId
        MDC.put("traceId", traceId);
        return true;
    }

    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
        super.postHandle(request, response, handler, modelAndView);
    }
}
